If it's Cloth covered Electrical Wire Your l ooking for, try The Brillman Company in MT. Jackson VA.
I havnt done Bisiness with them yet, but hope to soon. They have an Online Catalog and May have
what you are looking for. Don't forget to check out thier other bits too. Switches,Connectors,Mags
Braided Ground Straps,.and On and On. Good Luck with your project.